There are 5 directories
common: should match Aloha-Editor'scommonplugin directoryextra: should match Aloha-Editor'sextraplugin directorycnx: contains plugins written by Connexions and are not yet used by other groupsoerpub: contains plugins written by the OERPub community and are not yet used by other groupsoer: contains plugins used by both Connexions and OERPub
If you would like to contribute some plugins feele free to create another directory an put your plugins in there.